I would not allow this dog to have access to the small dogs. I wouldn't even allow it if you get the best trainer in the world. It's instinct, you can't train instinct in or out of them.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD